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Self Discharge

All batteries discharge over time, it varies as to the type of battery. Ni-Cad batteries discharge at approx 1% per day, Ni-MH discharge at approx 3 to 10% a day and Li-Ion less then 1-2 % per month. This is the main reason why most devices that are not used often use Ni-Cad batteries.

To keep your batteries topped up do NOT use a trickle charger, this WILL damage the batteries. If you want to stop your batteries from self discharging (whilst OFF your phone) then a power supply that can deliver 1 to 2 mA is idea.